PHP Strtotime() Function
A brief yet very nice description of the calculation of the date of Easter from … a PHP manual! – Roger Pearse
Timestamp Conversion to regular time and date · Issue #118 · jaggedsoft/php-binance-api · GitHub
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Introduction to PHP Date And Time Function
Convert MySQL Timestamp to Ago Time Format in PHP - YouTube
Convert Unix Timestamp To Date In PHP (Simple Examples)
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MySQL CONVERT_TZ() function - w3resource
PHP Date Exercise: Convert the date to timestamp - w3resource
PHP Time Ago Function - Phppot
Square Root in PHP | Finding Square Root of given number with Examples
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